US12007545B2 - Light sheet microscope and method for light sheet microscopy - Google Patents
Light sheet microscope and method for light sheet microscopy Download PDFInfo
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- US12007545B2 US12007545B2 US17/513,833 US202117513833A US12007545B2 US 12007545 B2 US12007545 B2 US 12007545B2 US 202117513833 A US202117513833 A US 202117513833A US 12007545 B2 US12007545 B2 US 12007545B2
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- 238000000386 microscopy Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 12
- 238000005286 illumination Methods 0.000 claims abstract description 80
- 238000012634 optical imaging Methods 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 21
- 238000003384 imaging method Methods 0.000 description 21
- 230000003287 optical effect Effects 0.000 description 18
- 238000006073 displacement reaction Methods 0.000 description 10
- 230000005855 radiation Effects 0.000 description 5
- 239000000975 dye Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/0004—Microscopes specially adapted for specific applications
- G02B21/002—Scanning microscopes
- G02B21/0024—Confocal scanning microscopes (CSOMs) or confocal "macroscopes"; Accessories which are not restricted to use with CSOMs, e.g. sample holders
- G02B21/008—Details of detection or image processing, including general computer control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/0004—Microscopes specially adapted for specific applications
- G02B21/002—Scanning microscopes
- G02B21/0024—Confocal scanning microscopes (CSOMs) or confocal "macroscopes"; Accessories which are not restricted to use with CSOMs, e.g. sample holders
- G02B21/0032—Optical details of illumination, e.g. light-sources, pinholes, beam splitters, slits, fibers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/06—Means for illuminating specimens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/24—Base structure
- G02B21/26—Stages; Adjusting means therefor
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/36—Microscopes arranged for photographic purposes or projection purposes or digital imaging or video purposes including associated control and data processing arrangements
- G02B21/365—Control or image processing arrangements for digital or video microscopes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
Definitions
- the present invention relates to a light sheet microscope and method of light sheet microscopy.
- the invention relates to a light sheet microscope comprising a sample volume with a sample stage for a sample carrier with a sample. Furthermore, the light sheet microscope comprises a detection device for imaging the sample volume along an optical imaging axis. The light sheet microscope additionally comprises an illumination device for illuminating the sample with a light sheet, characterized by a light sheet plane that is adjustable in the sample volume. The light sheet plane is oriented substantially perpendicularly to the optical imaging axis, and the light sheet has an illumination width b perpendicular to the light sheet plane.
- the light sheet microscope further comprises a processing device, which is connected to the detection device and to the illumination device and/or the sample stage. The processing device controls the illumination device and/or the sample stage for setting the location of the light sheet plane in the sample volume. The processing device is configured to control the detection device to record a plurality of images of the sample volume with different locations of the light sheet plane, with the result that a z-stack consisting of a plurality of images of the sample volume is produced.
- the invention further relates to a method of light sheet microscopy, in which, in a first step, a sample is illuminated with a light sheet.
- the light sheet is characterized by a light sheet plane, wherein the light sheet plane is arranged substantially perpendicularly to an optical imaging axis and the light sheet has an illumination width b perpendicular to the light sheet plane.
- a location of the light sheet plane along the optical imaging axis is set, wherein a plurality of images of the sample are recorded with different locations of the light sheet plane along the optical imaging axis, with the result that a z-stack consisting of a plurality of images of the sample is obtained.
- DE 10257423 A1 describes a microscope in which a sample is illuminated by a thin light stripe and the observation takes place perpendicularly to the plane of the light stripe. The light stripe is moved for the image recording, and fluorescence or/and stray light is recorded with a two-dimensional detector. Further publications relating to light-field microscopy are DE 10 2007 063 274 A1, DE 10 2013 107 298 A1, DE 10 2013 112 596 A1, US 2013/0286 181 A1, DE 10 2016 103 182 A1, and WO 2010/012980 A1.
- a light sheet microscope and a method of light sheet microscopy are to be provided, which reduces the photonic sample exposure and increases the detection speed.
- a light sheet microscope and a method for light sheet microscopy are provided.
- the light sheet microscope comprises a sample volume with a sample stage for a sample carrier with a sample and an optical detection device for imaging the sample volume along an optical imaging axis.
- the light sheet microscope furthermore comprises an illumination device for illuminating the sample with a light sheet.
- the light sheet is characterized by a light sheet plane that is adjustable in the sample volume and in which an illumination axis of the illumination unit is located.
- the light sheet plane of the light sheet lies substantially perpendicularly to the optical imaging axis and has an illumination width b perpendicularly to the light sheet plane.
- the light sheet microscope furthermore comprises a processing device, which is connected both to the optical detection device and also to the illumination device and/or the sample stage.
- the processing device controls the illumination device and/or the sample stage for setting the location of the light sheet plane in the sample volume, wherein the processing device is configured to control the optical detection device to record a plurality of images of the sample volume with different locations of the light sheet plane, with the result that a z-stack consisting of a plurality of images of the sample volume with the sample, which is located therein, is produced.
- Such an arrangement in the light sheet microscope makes image recording of specific, individual sample planes located within the sample in the sample volume possible, without the need to mechanically cut up the sample.
- the light sheet is generated for example using a cylindrical optical unit or by scanning a laser beam. Owing to the illumination with the light sheet, only dyes of the sample in the light sheet plane that in embodiments corresponds to individual sample planes are excited in a targeted manner. This excitation generates fluorescent radiation from the light sheet plane.
- the fluorescent radiation of the light sheet plane is detected by a focal plane of the optical detection device, that is to say the plane into which the optical detection device is focused (in which the focal point of the optical detection device is located), being generated in the light sheet plane.
- the focal plane can also deviate axially along the optical imaging axis from the light sheet plane, but must be located within the light sheet.
- the processing device is configured such that it controls the illumination device and/or the sample stage to displace the light sheet plane and the focal plane of the imaging in the sample volume such that both are moved step-by-step through the sample volume and thus through the sample and the sample is thereby scanned step-by-step.
- a displacement of the light sheet plane and of the focal plane can be realized by a displacement of the sample itself, for example by displacing the sample stage with the aid of the drive, or the sample remains in its fixed position and the illumination device is moved in relation to the sample.
- the displacement of the light sheet plane in the sample volume is coupled or automatically connected to a displacement of the focal plane in the sample volume in the same direction such that the focal plane is always located within the light sheet.
- the processing device is furthermore configured such that it controls the detection device after every displacement of the light sheet plane.
- a plurality of images of individual sample planes are recorded step-by-step, wherein the light sheet plane and the focal plane in each image are in a different location in relation to the sample.
- a stack is produced, the images of which come from different depths along the imaging axis. This results in a spacing a between the locations of the light sheet plane of axially successive images of the stack.
- This spacing measured along the optical imaging axis, must always be greater than/equal to half the illumination width b, likewise measured along the optical imaging axis, but must not be greater than the illumination width b.
- the light sheets in the individual images recorded with adjacent locations of the light sheet plane in this case overlap.
- the pair-wise overlap that is thus produced ensures that all sample regions are exposed at least once, although for image recording purposes, only the regions of the sample in the sample volume that are also detected are always illuminated with the light sheet.
- the light sheet thickness is preferably 0.5 to 10 ⁇ m, and the stack of samples of, for example, millimeter size is thus composed of more than a thousand images.
- What is ultimately important for the imaging is the relative movement of the sample volume with respect to the detection device.
- This relative movement can be realized by different scanning principles.
- One known principle is the displacement of the detection device (and of the light sheet illumination device that is coupled thereto and is generally emitting light perpendicularly thereto) along the optical axis of the imaging.
- This direction is typically referred to as the z-direction in microscopy and constitutes an axial direction with respect to the imaging.
- axial is mentioned herebelow, it refers to the imaging, that is to say it denotes a depth direction of the imaging. In conventional microscopy, this is the z-axis.
- the unit of detection and illumination is displaced along the optical axis of the imaging, the corresponding result is an image stack, the images of which are located one behind the other in the z-direction.
- An alternative of this is known from DE 10 2013 107 297 A1.
- the illumination axis and the detection axis are likewise substantially perpendicular, and scanning is realized in that the sample is displaced in a plane that contains neither the illumination axis nor the imaging axis. This, too, ensures that different depth regions in the sample volume are equally scanned and a stack of images is produced.
- the images in that case are not only arranged spaced apart along the optical imaging axis, that is to say in the conventional z-direction, but are at the same time also laterally shifted with respect to one another with respect to the imaging axis.
- This shift can be compensated for by simply displacing the individual images backward.
- the backward displacement compensates for the lateral shift (transversely to the imaging axis) caused by the angle between the plane in which the sample is displaced and the illumination axis (or the perpendicular on the imaging axis).
- the technical solution explained here can be realized with both variants. Where the second of the variants is explained below, this is merely an example.
- the processing device is configured to compute intermediate images for the stack that correspond to images that would have been recorded with virtual locations of the light sheet plane.
- the number of the images required for imaging the sample is reduced, wherein the stack is recorded with a number of images that by itself is not sufficient to image the sample in a high quality.
- the intermediate images for the stack are mathematically reconstructed.
- Each image of the stack represents a projection according to a point spread function (PSF) along the optical imaging axis. This means that each image of the stack contains image information originating from different, axially spaced-apart sample planes. Due to the overlap, it is possible to mathematically reconstruct from this image information the intermediate images.
- PSF point spread function
- the photonic exposure of the sample is significantly reduced.
- the speed of the recording of the stack is increased, preferably by the factor 3 , with respect to recording without reconstruction of the intermediate images. By reconstructing the intermediate images, the quality of the imaging of the sample still remains high.
- the quality of the reconstruction can preferably be improved in that the illumination is structured in the axial direction, that is to say along the optical imaging axis, during the image recording of the stack.
- Measures and setups that are suitable herefor are known from DE 10 2018 207 821 A1, the disclosure content of which is here incorporated in its entirety. As a result, planes projected within the point spread function have a lesser contribution.
- the method of the light sheet microscopy proceeds in three steps.
- a first step the sample is illuminated with a light sheet that is characterized by a light sheet plane, wherein the light sheet plane is arranged substantially perpendicularly to an optical imaging axis and the light sheet has an illumination width b perpendicular to the light sheet plane.
- the location of the light sheet plane in the sample is set.
- a plurality of images of the sample with different locations of the light sheet plane and the focal plane in the sample are recorded, with the result that a stack consisting of a plurality of images of the sample from different depth regions of the sample is produced.
- Two successive locations of the light sheet plane have between them a spacing a, which is greater than/equal to half the illumination width b, but is not greater than the illumination width b—measured in each case along the optical imaging axis.
- a spacing a which is greater than/equal to half the illumination width b, but is not greater than the illumination width b—measured in each case along the optical imaging axis.
- FIG. 1 shows a light sheet microscope
- FIG. 2 A shows illumination of a sample with a light sheet in a first position.
- FIG. 2 B shows illumination of a sample with a light sheet in a second position.
- FIG. 2 C and FIG. 2 D show illumination of a sample with a light sheet in a first position and a light sheet in a second position.
- FIG. 3 shows a flowchart for the method for light sheet microscopy.
- FIG. 1 illustrates a light sheet microscope capturing a sample volume 1 with a sample stage 6 for a sample carrier 2 with a sample 4 .
- the sample 4 is illuminated with a light sheet 12 using an illumination device 8 , characterized by an illumination axis 10 .
- the light sheet 12 is characterized by a light sheet plane in a first location 22 and has an illumination width b perpendicular to the light sheet plane.
- An optical imaging axis 16 of an optical detection device 14 is arranged perpendicular to the light sheet plane in the first location 22 .
- the optical detection device 14 is focused into a focal plane 11 . In this embodiment, this focal plane 11 lies exactly on the light sheet plane, but it can also lie outside of the light sheet plane, provided it is located within the light sheet 12 . This precondition must also be observed in the subsequent displacement.
- the sample stage 6 is driven by a drive 17 such that the position of the sample stage 6 and thus of the sample carrier 2 , located thereon, with the sample 4 is settable relative to the illumination device 8 and synchronously also relative to the detection device 14 .
- the light sheet 12 and the focal plane 11 are synchronously displaced in the sample 4 by means of the drive.
- the locations of the light sheet 12 and the focal plane 11 in this case remain constant.
- the illumination device 8 , the optical detection device 14 , and the drive 17 are connected to a processing device 20 via electrical lines 18 .
- the sample 4 in its position and to either locate the drive 17 at the illumination device 8 in order to move the illumination device and thus the light sheet 12 relative to the sample 4 , or to displace the light sheet by way of an optical adjustment, for example with a scanner, along the optical imaging axis 16 .
- the focal plane 11 is then also adjusted otherwise in the same sense and synchronously, for example by refocusing or moving the detection device 14 .
- FIGS. 2 A and 2 B show the arrangement according to FIG. 1 , wherein the view of the sample volume 1 with the sample stage 6 , the sample carrier 2 , and the sample 4 is illustrated in detail, and the sample stage 6 with the sample carrier 2 and the sample 4 within the sample volume 1 is in FIG. 2 B displaced along the movement axis 13 compared with FIG. 2 A .
- the processing device 20 controls the illumination device 8 to illuminate the sample 4 with the light sheet 12 .
- the light sheet plane is defined thereby in the first location 22 in the sample 4 .
- the light sheet 12 is generated for example using a cylindrical optical unit or by scanning a laser beam. Owing to the illumination with the light sheet 12 , only dyes of the sample 4 located in the light sheet plane are excited, as a result of which fluorescent radiation from the light sheet plane is generated.
- the optical detection apparatus 14 In order to detect this fluorescent radiation, the optical detection apparatus 14 is provided.
- the processing device 20 controls the optical detection device 14 , for example a camera of the detection device, such that an image is generated from the focal plane 11 located perpendicularly to the optical imaging axis 16 .
- the focal plane 11 is located in the light sheet plane but can also be shifted along the imaging axis 16 parallel to the light sheet plane; however, it is located within the light sheet 12 in any event.
- the optical detection device 14 is focused into the focal plane 11 and detects the fluorescent radiation that is emitted from the light sheet plane illuminated with the light sheet 12 . Owing to the arrangement according to FIG. 1 , the recording of individual sample planes with a fixed relative position of light sheet 12 and focal plane 11 in the light sheet microscope becomes possible by a simple lateral displacement of the sample 4 .
- the light sheet 12 and the focal plane 11 are synchronously adjusted in the sample volume 1 .
- FIGS. 2 A and 2 B two locations 22 and 26 for the synchronous displacement of light sheet 12 and focal plane 11 in the sample volume 1 are illustrated.
- the processing device 20 which performs the location setting (e.g. via the drive 17 ) of the optical detection device 14 , in this way generates a stack comprising a plurality of images of the sample 4 , wherein each image lies with a different location 22 , 26 of the light sheet plane and the focal plane 11 .
- FIG. 2 C shows the same setup as FIGS. 2 A and 2 B , but the light sheet 12 is no longer illustrated but merely the light sheet plane in the first location 22 and in the second location 26 .
- FIG. 2 C illustrates the locations 22 , 26 , shown in FIGS. 2 A and 2 B , of the light sheet planes in one image; the focal plane is not shown for simplification purposes. Due to this illustration, a spacing a can be seen, which comes about between the light sheet plane in the first location 22 and in the second location 26 if a first image of the stack is recorded upon illumination of the sample 4 with the light sheet 12 in the first location 22 and a second image of the stack is recorded upon illumination of the sample 4 with the light sheet in the second location 26 .
- FIG. 2 D shows, in addition to FIG. 2 C , the light sheet 12 in both locations 22 , 26 .
- An overlap ⁇ z and the illumination width b of the light sheet 12 can be seen. Both values are measured along the optical imaging axis.
- the processing device 20 controls the illumination device 8 and/or the sample stage 6 in a manner such that a spacing a between the locations of the light sheet plane of images of the stack, which are recorded successively, along the optical imaging axis is produced.
- This spacing a is greater than/equal to half the illumination width b, but not greater than the illumination width b (cf. FIG. 2 D ).
- the overlap ⁇ z between the sample volumes that correspond to the light sheet 12 with the light sheet plane in the first location 22 and to the light sheet 12 with the light sheet plane in the second location 26 is produced, which ensures that all regions of the sample 4 are exposed at least once.
- the processing device 20 is furthermore configured to compute intermediate images for the stack, which correspond to images during the illumination with the light sheet 12 with the light sheet plane in a virtual location. Owing to this computation of the intermediate images with the processing device 20 , it becomes possible for the number of the images with which the stack is recorded in order to record the sample 4 with a high quality to be able to be reduced in a targeted manner. The sample can thus be stressed less and at the same time the recording speed can be increased without significantly deteriorating the imaging quality.
- the mathematical reconstruction of the intermediate images becomes possible in that each image of the stack presents a projection according to a point spread function (PSF) along the optical imaging axis 16 . In respect of the reconstruction, reference is made again to DE 10 2018 009 056 A1.
- PSF point spread function
- the illumination is structured axially (i.e. along the imaging axis) during the image recording, the quality of the reconstruction of the virtual locations of the light sheet planes can be improved because planes projected within the PSF have a lesser contribution.
- DE 10 2018 009 056 A1 describes possible measures in this respect, in particular an asymmetry in the light sheet illumination. It is with particular preference realized by the different locations of the light sheet, as already described.
- the axial structuring is known from DE 10 2018 207 821 A1, which has likewise already been mentioned in the introductory part.
- FIG. 3 shows a flowchart for a method for light sheet microscopy.
- a first step S 1 the sample 4 is illuminated with the light sheet 12 , which is characterized by a light sheet plane in a first location 22 .
- the light sheet plane in the first location 22 is located in the illumination axis 8 , wherein the light sheet plane is arranged substantially perpendicularly to the optical imaging axis 16 and the light sheet 12 has an illumination width b perpendicular to the light sheet plane.
- the light sheet plane in the sample volume is adjusted to a second location 26 .
- An image of the sample 4 is recorded both in the first location 22 and also in the second location 26 of the light sheet plane, wherein a focal plane 11 of the imaging is always located in the light sheet.
- a stack consisting of a plurality of images of the sample 4 is recorded with the illumination with light sheets 12 in different locations of light sheet plane and focal plane in the sample.
- the spacing a, measured along the optical imaging axis 16 , between successive locations of the light sheet plane in the images of the stack is established to be greater than/equal to half the illumination width b, but not greater than the illumination width b.
- the intermediate images for the stack are computed.
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DE102020128524.8A DE102020128524A1 (en) | 2020-10-29 | 2020-10-29 | Light sheet microscope and method of light sheet microscopy |
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